Top Voted Answer

Watching the credits from the option menu won't do it. You need to watch them in their entirety after you beat the game. So beat the game again, but this time set the controller down and let it all play out.

Note: You'll first see Dollface's ending, then credits, then epilogue 1, then more credits, then epilogue 2.

Answers

You must watch the credits in its entirety.Epilogue 1 is unlocked after watching the first part of the credits which has the video in the background while showing the big names.Epilogue 2 is unlocked after watching the second part of the credits which is your typical scrolling credits.